Page 11 - Vibrations 5

To solve this, use the following keystrokes (MODE)53

1=z1.4=0.48==

=

= 1 and = 2/5. These are the eigenvalues. The
2
1
frequencies are related to these values,

= √ = 1 and = √2/5
1
2
1
The mode shape can be determined by considering,

0.8 − −0.4 1
( ) ( ) =
−0.2 0.6 − 2

Using the first eigenvalue,

0.8 − 1 −0.4 1
( ) ( ) =
−0.2 0.6 − 1 2

or

10